The one concerning Conradt Hertzog that came from Rotterdam, South Holland on Sep 12.1750 in the ship Priscilla, interests me.My great uncle, H. Willis Hartsock, wrote a brief outline of my line of Hartsock's and documents that this Conradt, carpenter and wagon-maker, started it all in Frederick County, Maryland and moved to Centre County (Matternville area),Pennsylvania around 1800.I have listings of, at least the males,from him through my generation (1937).